the best GPU for gpt-oss-20b in 2026 — 16GB gets you in, 24GB is the sweet spot

gpt-oss-20b fits on a 16GB card, but the model's huge context can quietly overflow it. Here are the best GPUs to run it, from the cheapest 16GB…

Aliteq
Ravi Malhotra · Hardware Editor

Best GPUs for gpt-oss-20b

Cheapest entry: RTX 5060 Ti 16GB — runs it at 8K context for the least money.

Best GPUs for gpt-oss-20b

Fast 16GB: RTX 4080 / RTX 5070 Ti — high tok/s, great for normal context.

Best GPUs for gpt-oss-20b

Value sweet spot: used RTX 3090 24GB — headroom for the 128K context, cheapest 24GB.

Best GPUs for gpt-oss-20b

Fastest: RTX 4090 24GB — ~225 tok/s and full context room.

Best GPUs for gpt-oss-20b

Avoid 8-12GB — the model plus context won't fit comfortably.

Best GPUs for gpt-oss-20b

Rule: 16GB for everyday use, 24GB if you want long documents.

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the best GPU for gpt-oss-20b in 2026 — 16GB gets you in, 24GB is the sweet spot

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